Transmitting apparatus for wireless-telegraph stations.



F. G. SIMPSON.

TRANSMITTING AIPARATUS FOR WIRELESS TELEGRAPH STATIONS.

APPLICATION FILED Nov. 29. I915.

1,199,21 3. Patented Sepf. 26, 1916.

- 8 .5' 2 4 /e k I b 3 ,1

WIT/V588 INVENTOR A TTORII/EI PATENT oFFIcEQ rnnnnnrcx G. SIMPSON, or SEATTLE, wesnzneroii.

TRANSMITTING APPARATUS non WIRELESS-TELEGRAPH s rhrion's.

Specification of Letters Patent. Patented Sept, 26,1916.

Application filed November 29, 1915. Serial No. 64,180.

T 0 all whom it may concern Be it known that I, FREDERICK G. SIMP- SON, citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented a certain new and useful Improvement in Transmitting Apparatus for l/Vireless-Telegraph Stations, of which the following is a specification.

My invention relates to improvements in transmitting apparatusof wireless telegraph stations and its particular object is to provide means in combination with certain electric circuits which include a condenser and an adjustable spark-gap, whereby, upon the discharge of said condenser through said spark-gap then no resultant oscillations can take place. in that one of said circuits within whiclrsaid spark-gap is included. I accomplish this object by devices which I haveillustra-ted diagrammatically in the accompanying drawing, wherein 1 designates an electric generator of alternating currents, which generator 1 is provided with terminal contact brushes 2 and 3, and from the brush 2 extends a conductor 4 which connects with one terminal of a telegraph key 5 from whose other terminal extends a conductor 6 that connects with one terminal of the primary coil 7 of a transformer 8 the other terminal of said primary coil being connected to the terminal brush 3 by a conductor 9.

The secondary coil 10 of the transformer 8 has one of its terminals connected by a conductor 11 with the anode 12 of a mercury valve 13, of well known form, the

cathode 14 of said mercury valve 13 being connected by a conductor 15 with one terminal of a resistance coil 16 whose other tor 21 to one terminal of a source of electricity, as a battery 22,'.whose other termlnal is connected by a conductor 23 with one terminal of a switch 24, Whose other terminal is connected to the conductor 15. at a point between the cathode 14 and the resistance coil 16, whereby is formed a switch-contro led local circuit between the anode 20 an the cathode 14.

minal 42.

The other terminal of the secondary coil 10 1S connected'by a conductor 25 to one end of. both of two conductors 26 and 27, the; other end of the conductor 26 being connect-- ed to one side 28 of a variable condenser 29 whose other side 30 is confiected by a con-1; ductor 31 to the conductor 17 'atza" point thereonlbetween the resistance-coil 16 and 19 ductor 27 is connected to the outer. end32 I the earth 18, while the other end of the conof a spiral conductor 33 whose inner terminal 34 is connected to one terminal of a va riable inductance 35, Whose other terminal is connected with an antenna 36. v

An adjustable spark-gap 37 is disposed with one of its terminals connected with the conductor 31 while its other terminal is connected by a conductor 39 to the anode 40.01? a' mercury valve 41 whose cathode terminal 12 is connected at a oint 38 on the outermost convolution of tiie spiral conductor The mercury valve 41 is in all respects like the mercury valve 13, being provided with an auxiliary anode 43 which is connected to one terminal of a source of electricity, as a battery 44, whose other terminal is connected to one terminal of a circuit breaking switch 45 whose other terminal isconnected by a conductor 46 with the cathode ter- The operation of the apparatus when arranged as illustrated and described is as follows: The switches 24 and 45 are each moved to a closed position and thereupon the mercur valves 13 and 41 are tilted sidewise in a direction to cause the mercury contained therein to-make connection with their respective anodes 20 and 43 thus completing the circuit through-their respective batteries 22 and 44 to their'respective cathode terminals 14 and 42, through which circuitsv current of the respective one their batteries 22 and 44 may flow, and thereupon said mercury valves 13 and 41 are moved back to perpendicular positions to cause such cur, rents to establish electric arcs between the anode; 20 and the cathode 14 and-between the anode 43 and the cathode 42, thus, in a well known manner,'to prime said nercury valves-13 andfil'l whereby electrical impulses from the secondary coil 10"may find passageway through the mercury valve 13 from its anode 121:0 its cathode 1 1 and whereby electrical discharges from the condenser 29 that jump the spark-gap 37 may find pass- Way through the mercury valve 41 from its can he coiiiiiiunicuici charge he condense:- in! by f the ijetci'posiiion of the ZLQZCUTY like poi icuiicu to sand. cozrm myiod of one had? two successive H 1 v t e gene is of a (u i Hhiv is har s the co.

' it '50 hi 1'; 37, with which i I aids upon its c1412;

Y resistance ii. cuc- *f fiiic ch21 ging Clltiulil 1M1 when, i I

. "ad 130 such degree as 'Wi, said spark-gap 37, it m1 u der c e in the dirccibioii from. the side xii-gap 57, 'thcncc through y w -c 41 to the point 38 on the In! -:;-cmluctoc thence throughc. poi

Lion of the outer convohiticn of said. spim conductor c the conductor 27, thence the side 28 ct )ischurge wii.

again will q i. i.

impuise denser 29 in of such circuit (which I cuit c1: dzuchci'ge i mushy S11} 1 Ru-W inc spurlogap and :i 'iicii known 1: Hie ratio of cm and Where EL 0021 charge thio i a arlcgap, the

y cf such discharge is h:- create oscils which at first are relatively cf h dc out which i piiiy door-ease :1 3 pm o and i d. cunt there would he no current in u ticzi that is the the discharge current of erbiti. ccnd the prcseuceki the m triggei? (:ii' "i.

- due sz, Eiii'eciion to QDLiHCiIOiS 26 and 27, the ii. coiuihic fioi' the vari- V the antenna 3 earth l8, of the conductor 1'? and the com "(institutes an, oeciihiting circuit .11 cwlihitions may have great persisnml, 2oiieinp1atiiig the antenna 36 will "viih condenser 29, the oscillation sum-ting from i be directed through said oscillating: circuil and subsequent oscillaiiciis derived 'ihcicfrom will persist within um circuit and not pass across the sparkgzip 37 iiiwoye provided said spark-gap is picpcriy adjusted, since there can be no p king arc between the electrodes of said spark-gap 3! by ieasouof the action of the y valve 13, the current therethrough at ZBTO ai the moiucn'c of the discf the cciicieiisei' and, therefore, voitag-c, dcrii eci from such current,

any

I the between ciectiodcs 0f the spark-gap 37 ansi the mercury valve 13 also direction is or iio'o-cciyistiuent of the spark- 9'? r if].

than; at, the inS Jlili, of the initial 5 the condenser 29 through the earth 18 through *i'iikagcp 37, the inner convolution of i. conductor 33, inductance and 6 but in such iattcr circuit the rnuc of cajacity tc inducitance 155 so very sumii chmosciiizatioiis would have a tendency to persist therein were it not for the mercury valve 41. I

A Waste of energy of the initial discharge foc condenser is prevented by the in- 1 ion hetwccn that, port-ion of the i u of the spii'ai conduciig miuvoiu'tions of said joiufl as constituting a conspiral conductor 33, said portion. of such outermost convolution forming a part of the circuit which includes the conductors 27 and 26 together With the condenser 29 and sparkgap 37, (which circuit I have hereinbefore termed the trigger circuit) While the re maining convolutions of said spiral conductor 33 form a part of the circuit which I have hereinbefore termed the oscillating circuit and which oscillating circuit includes the whole of the spiral conductor 33, the inductance' 35, the antenna 36, earth 18, a part of the conductor 17, the conductor 31, the condenser 29, and conductors 6 and 27. Such inductive relation between said trigger circuit and said oscillating circuit is not absolutely necessary but it improves theetficiericy ofthe apparatus. After a period of time the condenser 29 Will be charged anew and the same cycle of operations Will be repeated,the'extent of such period of time being dependent upon the capacity of the condenser 29, the amount of resistance of the coil.

16, the amount of the resistance of the mercury valve 13, and the amount of other resistance in the charging circuit together with the inductance distributed through said charging circuit including the induc'tances of the secondary coil 10 of the transformer 8.

Intelligible signals may be formed in the usual Way by a manipulation of the telegraphkey 5 which signals Will be emitted in the usual manner from the antenna 36 in the form of groups of electromagnetic wave trains, which groups of electromagnetic Wave trains may sufiiciently effect any detector of the commonly used types that may be employed in the receiving apparatus of a distant Wireless telegraph station, and

nothing of the nature of a heterodyne or tikker is required in such distant Wireless telegraph station.

What I claim is: 1. Transmitting apparatus for Wireless telegraph stations, which embodies an oscillationcircuit Within Which is included a condenser, the Whole of a spiral conductor, a varialf'lle inductance, and an antenna in connection W1th the earth and a trigger circuit associated with said oscillating circuit,

within which trigger circuit is included that part of said oscillating circuit containing said condenser and a portion of said spiral conductor, together with a rectifying valve and a spark-gap.

2. Transmitting apparatus for 'Wireless telegraph stations, which embodies a keycontrolled source of electricity; a charging circuit associated With said source of electricity, which charging circuit includes a rectifying valve; an oscillating circuit connected to said charging circuit, which oscillating circuit includes a condenser, the whole of a spiral conductor, a variable inductance and ,;aj;' grounded antenna; and a trigger circuit associated with said oscillating circuit, 'within which trigger circuit is included that part of said oscillating circuit containing said condenser and a portionof said spiral conductor, togetherwith a rectifying valve and a spark-gap.

In Witness whereof, I hereunto' subscribe my name this 22nd day of November, A. D.

1915. Y FREDERICK-G. SIMPSON. Witnesses: FRANK WARREN,

O. JOHNSON. 

